JPH0814171A - Horizontal type scroll compressor - Google Patents

Abstract

PURPOSE:To efficiently prevent liquid compression even when there is a liquid refrigerant stagnation or a large amount of liquid reflux and to prevent starting failure and breakage of a spiral body due to the liquid compression. CONSTITUTION:A spiral body winding end part of a fixed scroll 2 is made unsymmetrical by extending it to a portion to face against a spiral body winding end part of a movable scroll, suction ports 22, 23 are made to approach it and positioned at an upper part of a closed casing 1, a suction passage 24 is provided on an upper part of a housing 4, a narrow resistant oil return passage 25 is provided, and a gas fluid is sucked only from the suction passage 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a horizontal scroll compressor,
More specifically, the present invention relates to a horizontal scroll compressor in which a fixed scroll having an end plate and a scroll and a movable scroll are engaged with each other.

[0002]

2. Description of the Related Art Conventionally, a horizontal scroll compressor used in a refrigeration system is known as disclosed in Japanese Patent Laid-Open No. 6-66274.

As shown in FIG. 5, this scroll compressor has a horizontal hermetic casing having a compression element E in which a fixed scroll FS having an end plate and a scroll body and a movable scroll OS are meshed with each other. A first bearing housing H is provided on one side of C, the other side is provided with an electric motor M for orbiting and driving the movable scroll OS, and the compression element E side is provided with a first bearing housing H for supporting one end side in the axial direction of the drive shaft S. Although not shown on the side opposite to the compression element E, a second bearing housing for supporting the other end side in the axial direction of the drive shaft S is provided, and the second bearing housing is sucked into the casing internal space A between the compression element E and the electric motor M. Tube J
While the first bearing housing H is opened, a partition member B made of a flexible material such as rubber and partitioning the suction side of the compression element E into the internal space A is provided in the first bearing housing H. A suction passage D that communicates the internal space A with the suction side of the compression element E is provided above H.

In FIG. 5, F is a fixed scroll F.
A partition wall provided on the back side of S to form the discharge chamber G,
In the discharge chamber G, a discharge port P is opened and a discharge pipe K is opened.

[0005]

However, the fixed scroll F in the conventional horizontal scroll compressor described above is used.
The end of the scroll of S of the scroll body is 180 degrees out of phase with the end of the end of the scroll of the flexible scroll OS, and therefore two compressions formed between the scrolls of the scrolls FS and OS. The inlet to the chamber would also be 180 degrees off.

Therefore, one of the inlets is provided with the horizontal casing C.
When it is positioned above the other inlet, the other inlet is positioned below, so that the discharge gas refrigerant discharged from the discharge pipe G is caused to flow through the evaporator of the refrigerating device to perform the defrost operation, and then the discharge is again performed. When a large amount of liquid refrigerant returns from the evaporator to the suction pipe J in the case where the discharge gas refrigerant discharged from the pipe G is caused to flow into the condenser of the refrigerating device to switch the refrigerating device from the defrost operation to the normal operation, this liquid is returned to the suction pipe J. When the refrigerant enters the suction passage D, the liquid refrigerant is sucked through the suction port located at the lower part, and liquid compression occurs, which causes a malfunction of the compressor such as breakage of the scroll.

Also, in the case of starting after the suspension for a long time, when the liquid refrigerant sunk in the bottom oil sump Q of the casing C is homed by the startup and the liquid refrigerant enters the suction passage D by this homing, There was a problem that liquid compression similar to the above occurred.

Further, by locating the suction ports at the upper and lower intermediate portions of the horizontal casing C, the height of the other suction port at the lower portion can be raised from the lower portion to the intermediate portion, so that some liquid compression is prevented. If possible, suction passage D
The liquid refrigerant that has entered into is sucked directly into each of the suction ports from the suction passage D, and the problem of the liquid compression still remains.

The object of the present invention is to effectively prevent the liquid compression from occurring even if the liquid refrigerant stagnates or a large amount of liquid returns, and problems such as starting failure due to liquid compression and breakage of the spiral body are caused. Is to solve with a simple configuration.

[0010]

In order to achieve the above object, the invention according to claim 1 comprises a fixed scroll 2 having an end plate and a scroll body, and a movable scroll 3, in which the scroll bodies are meshed with each other. A scroll compression element E is provided inside one side of the horizontal hermetic casing 1, and an electric motor M that turns the movable scroll 3 is provided inside the other side of the horizontal hermetic casing 1, and a casing internal space 12 between the compression element E and the electric motor M is provided. In the horizontal scroll compressor having the suction pipe 11 opened, the end of the scroll of the fixed scroll 2 at the end of the scroll is opposed to the end of the scroll of the movable scroll 3 at the end of the scroll. Extend to each scroll 2, 3
The suction ports 22 and 23 of the two compression chambers A and B formed therebetween are brought close to each other, and these suction ports 22 and 23 are arranged at the upper part of the casing 1, and between the compression element E and the electric motor M. A housing 4 is provided in the internal space 12 for partitioning the internal space 12 into a compression element side chamber 12A and an electric motor side chamber 12B, and an upper portion of the housing 4 communicates with a suction portion where the suction ports 22 and 23 open. While the suction passage 24 is provided, the suction pipe 11 is opened in the electric motor side chamber 12B, and the compression element side chamber 12A and the electric motor side chamber 1 are provided.
The resistance oil return passage 25 is provided between the 2B and 2B.

The invention according to claim 2 is the suction pipe 11.
The opening position to the electric motor side chamber 12B is shifted in the circumferential direction with respect to the suction passage 24 provided in the upper part of the housing 4. According to the invention of claim 3, the suction passage 24 provided in the housing 4 is brought close to each other. The suction ports 22 and 23 of the two compression chambers A and B are circumferentially displaced from each other. Further, in the invention according to claim 4, the suction passage 24 provided in the housing 4 is provided with respect to the suction ports 22 and 23. Suction port 22,
That is, the movable scroll 3 closing 23 is displaced forward in the orbiting direction of the movable scroll 3.

[0012]

In the invention according to claim 1, the spiral scroll end of the fixed scroll 2 is extended so that the scroll body and the scroll body of the movable scroll 3 are asymmetrical, and the suction port 2 is provided.
The compression element side chamber 12A in which the suction ports 22 and 23 are located close to each other and the suction ports 22 and 23 are arranged in the upper portion of the casing 1 and the suction ports 22 and 23 are opened by the housing 4.
Is separated from the electric motor side chamber 12B in which the suction pipe 11 is open, and the suction passage 24 is provided in the upper part of the housing 4 and the resistance oil return passage 25 is provided. Therefore, in the refrigeration system, the normal operation is restored after the defrost operation is completed. A large amount of liquid such as liquid refrigerant (hereinafter referred to as liquid refrigerant) returns to the suction pipe 11 as in the case, or the liquid refrigerant that has been laid at the time of start-up homs, and this homing causes the suction passage 2 to move.
Even if the liquid refrigerant enters the compression element side chamber 12A from 4,
It is possible to effectively prevent the liquid refrigerant from being sucked into the compression chambers A and B from the suction ports 22 and 23, so that the problem due to the liquid compression can be solved and the compression element side chamber 12A.
The oil can be effectively returned to the electric motor side chamber 12B, and the oil agitation by the movable scroll 3 can be prevented. Moreover, since the scrolls of the scrolls 2 and 3 are made asymmetric, the outer diameter of the scroll (outer diameter of the end plate) can be suppressed and the size can be reduced, but liquid compression can be prevented and its reliability can be improved.

Further, in the invention according to the second aspect, since the opening position of the suction pipe 11 is shifted in the circumferential direction with respect to the suction passage 24, even when a large amount of liquid refrigerant returns from the suction pipe 11, this liquid is returned. The refrigerant can be prevented from being directly sucked from the suction pipe 11 into the suction passage 24, the problem of liquid compression can be more effectively solved, and higher reliability can be obtained.

According to the third aspect of the present invention, since the suction passage 24 is displaced in the circumferential direction with respect to the suction ports 22 and 23, when the liquid refrigerant enters the suction passage 24, the liquid refrigerant scatters. It is possible to prevent the liquid refrigerant from being directly sucked into the suction ports 22 and 23, and thus to prevent the liquid refrigerant that is scattered from the suction passage 24 from being sucked into the suction ports 22 and 23, thereby causing a problem of liquid compression. Can be eliminated more effectively.

Further, in the invention according to claim 4, since the suction passage 24 is displaced with respect to the suction ports 22 and 23 to the front side in the orbiting direction of the movable scroll 3, that is, to the rear side of the winding end portion of the scroll body. When the liquid refrigerant scattered from the suction passage 24 and entering the compression element side chamber 12A enters the suction ports 22 and 23, it is necessary to bypass the spiral winding end end, and the invasion is further The effect can be effectively prevented, and the effect of preventing liquid compression can be further improved.

[0016]

EXAMPLE A scroll compressor shown in FIG. 2 has a fixed scroll 2 having an end plate 2a and a spiral body 2b on one side of a horizontal hermetic casing 1, and a movable scroll having an end plate 3a and a spiral body 3b. 3 and a scroll compression element E including 3 and a motor M for orbiting and driving the movable scroll 3 on the other side, and a drive shaft 5 interlocking with the motor M is provided in the casing 1. The eccentric shaft portion 7 supported on the housing 4 fixed to the side through the bearing 6a, and the eccentric shaft portion 7 provided at the shaft end portion of the drive shaft 5 bears the protruding cylindrical shaft 8 protruding from the rear side of the end plate 3a of the movable scroll 3. 6b to interlock by interlocking,
An Oldham ring 9 for preventing rotation is interposed between the end plate 3a of the movable scroll 3 and the housing 4, and the movable scroll 3 is orbitally driven with respect to the fixed scroll 2 by the drive rotation of the drive shaft 5. By swiveling drive, the gas fluid is compressed in the first and second compression chambers A and B formed between the spiral bodies 2b and 3b, and is discharged from the discharge port 10 provided in the central portion of the end plate of the fixed scroll 2. It was done.

In FIG. 2, 11 is the compression element E.
Is a suction pipe that opens into the casing internal space 12 between the motor M and the electric motor M, and 13 is a partition plate that is located on the rear side of the end plate of the fixed scroll 2 and is fixed to the casing 1 to partition the discharge chamber 14. The discharge port 10 is opened to the discharge chamber 14 through the discharge valve device 15 provided in the partition plate 13, and the discharge pipe 16 is opened to the discharge chamber 14.

Reference numeral 17 is a demister, and 18 is the discharge chamber 1.
An oil return capillary for returning the lubricating oil of 4 to the electric motor side chamber 12B, 19 is provided integrally with the partition plate 13 but is a gas shielding part, 20 is a capillary guide plate, and 21 is an installation for mounting the casing 1 on the installation surface GL in an inclined manner. It's a leg.

Therefore, in the embodiment shown in FIG. 1, in the scroll compressor configured as described above, the winding end end of the spiral body 2b in the fixed scroll 2 is moved from the winding end end to the movable scroll. Spiral body 3b in 3
Extend approximately 180 degrees to the part facing the end of winding,
Two compression chambers A formed between the scrolls 2 and 3,
The suction ports 22 and 23 of B are brought close to each other so that the suction ports 2
2 and 23 are arranged in the upper portion of the casing 1 as shown in FIG. 1, and the housing 4 provided in the internal space 12 between the compression element E and the electric motor M allows the internal space 12 to pass through the suction port 22. , 23 opening the compression element side chamber and the suction pipe 11 opening the electric motor side chamber 12B
And a suction passage 24 communicating with the suction portion of the compression element side chamber 12A in which the suction ports 22 and 23 open, and the compression element side chamber 12A and the electric motor side chamber. The resistance oil return passage 25 is provided between the 12B and 12B.

More specifically, the inner wall surface of the extension portion that extends the end of the spiral scroll of the fixed scroll 2 to the end of the spiral scroll of the movable scroll 3 is the same involute as the other portion or its approximate curve. Further, the suction volume of the first compression chamber A formed by the inner wall surface of the scroll body of the fixed scroll 2 and the outer wall surface of the scroll body of the movable scroll 3 by the formation of the extended portion is equal to that of the fixed scroll 2. This is larger than the suction volume of the second compression chamber B formed by the outer wall surface of the scroll and the inner wall surface of the scroll of the orbiting scroll 3, and the compression ratio of the first compression chamber A and the compression ratio of the second compression chamber B. Is different from that of the movable scroll 3
Alternatively, the first scroll is provided on the spiral scroll start side of the fixed scroll 2.
A compression ratio adjusting notch is provided for advancing the discharge start angle of the compression chamber A from the discharge start angle of the second compression chamber B and adjusting the compression ratios in the first and second compression chambers A and B to be the same. Further, the housing 4 has a circular outer peripheral surface facing the inner peripheral surface of the casing 1 as shown in FIG. 1, and the upper portion thereof is cut out over a predetermined range to provide the suction passage 24. And a small gap a (20 to 30 μm) between the inner peripheral surface of the casing 1 and
The resistance oil return passage 25 is formed.

That is, the outer diameter of the housing 4 is slightly smaller than the inner diameter of the casing 1 so that it can be loosely fitted in the casing 1, and a plurality of welding pins are provided on the outer peripheral portion as shown in FIG. 26 is embedded in the casing 1, a welding hole is formed in the casing 1 at a portion facing the attachment portion of the welding pin 26, and the housing 4 that is loosely fitted in the casing 1 is welded to form the slight gap a. The resistance oil return passage 25 is formed by this gap a.

The resistance oil return passage 25 is provided in the drive shaft 5
The lubricating oil that supplies the thrust receiving surface that supports the bearings 6a, 6b and the end plate 3a of the movable scroll 3 from the oil supply passage 27 provided in the compression element side chamber 12A, more specifically,
A narrow oil return passage mainly for returning from the receiving concave portion 28 of the protruding shaft portion 8 provided in the housing 4 to the electric motor side chamber 12B, the lubricating oil or the liquid refrigerant flows backward from the oil sump 29 provided in the bottom portion of the electric motor side chamber 12B. While preventing this, it is possible to prevent lubricating oil from accumulating in the receiving recess 28 and causing oil agitation by the movable scroll 3.

When the resistance oil return passage 25 is formed with a small gap a provided between the casing 1 and the housing 4, the housing 4 is fixed to the casing 1 by welding using the welding pin 26. This is advantageous in that the drive shaft 5 can be easily centered, and thus the oil return passage 25 can be formed and the centering can be easily performed. However, as shown in FIG. It may be provided and formed, or it may be formed by a notch although it is not shown, and the small gap a and the communication small hole b may be used together.

The suction passage 24 may be provided in the upper portion of the casing 1 in accordance with the opening positions of the suction ports 22 and 23 arranged in the upper portion of the casing 1.
It is preferable to shift in the circumferential direction. In particular, as shown in Figure 1,
The suction ports 22 and 23 are compared with the suction ports 22 and 23.
It is preferable that the movable scroll 3 is displaced to the front in the orbiting direction of the movable scroll 3, that is, to the rear side of the suction ports 22 and 23.

Further, the suction pipe 11 is opened at the upper part of the electric motor side chamber 12B, and it is preferable that the opening position is displaced in the circumferential direction with respect to the suction passage 24.

Next, the operation of the embodiment shown in FIG. 1 will be described. When the movable scroll 3 orbits by the drive of the electric motor M, the gas fluid is sucked into the first and second compression chambers A and B from the suction ports 22 and 23. Since the scrolls 2b and 3b of the orbiting scroll 3 are made asymmetrical and the suction ports 22 and 23 are brought close to each other, and the scrolls 2b and 3b are provided on the upper part of the casing 1,
It is possible to suppress the liquid refrigerant from being sucked in through the suction ports 22 and 23 while achieving downsizing which is one of the advantages of the asymmetrical spiral type.

That is, when applied to a refrigeration system, at start-up,
When the liquid refrigerant laid down during the homing is homing in the electric motor side chamber 12B, or when returning to the steady operation after the defrost operation, a large amount of the liquid refrigerant is discharged from the system side, that is, the evaporator that discharges the discharged gas refrigerant during the defrost operation. Suction pipe 11
These liquid refrigerants are sucked from the suction ports 22 and 23 when returning to the electric motor side chamber 12B from the suction ports 22 and 23. However, in the embodiment of FIG. Since it is provided, it is possible to suppress the liquid refrigerant from being sucked in through the suction ports 22 and 23, and moreover, the opening position of the suction pipe 11 to the electric motor side chamber 12b is circumferentially arranged with respect to the suction passage 24. In addition, the suction passage 24 is connected to the suction ports 22, 2
Since it is displaced to the back side with respect to 3, the suction pipe 1
1, the gas fluid containing the liquid refrigerant introduced into the electric motor side chamber 12B first flows in the electric motor side chamber 12B in the circumferential direction along the inner peripheral surface of the casing 1 as shown by the dotted arrow in FIG. As shown by the solid line arrow, it enters the compression element side chamber 12A from the suction passage 24, then changes its flow direction and is sucked into the suction ports 22 and 23. The liquid refrigerant is separated in the process of being sucked from the suction ports 22 and 23 via the suction port, and the scattered liquid refrigerant can be prevented from being sucked directly into the suction ports 22 and 23. The gasified refrigerant is sucked in. Therefore, it is possible to effectively prevent the liquid compression due to the suction of the liquid refrigerant.

The lubricating oil supplied to the bearings 6a and 6b and the thrust receiving surface is returned to the electric motor side chamber 12B through the resistance oil return passage 25, so that the receiving concave portion 28 is formed.
In addition, it is possible to prevent the lubricating oil from being accumulated in the movable scroll 3 and to prevent the oil from being stirred by the movable scroll 3, and it is possible to reduce the amount of oil rising, and it is also possible to prevent the liquid refrigerant and the lubricating oil from flowing back from the oil reservoir 29.

Further, since only the suction passage 24 is provided in the housing 4, the rigidity thereof can be improved, and therefore, the strain on the thrust receiving surface can be reduced and the reliability of the compressor can be improved.

[0030]

According to the invention described in claim 1, the spiral scroll end of the fixed scroll 2 is extended to make the scroll body and the scroll body of the movable scroll 3 asymmetrical, and the suction ports 22, 23 are formed. And the suction ports 22 and 23 are arranged above the casing 1, and the compression element side chamber 12A in which the suction ports 22 and 23 are opened by the housing 4 is connected to the electric motor side chamber 12B in which the suction pipe 11 is opened. A partition is provided, and the suction passage 24 is provided at the upper part of the housing 4.
In addition, since the resistance oil return passage 25 is provided, a large amount of liquid refrigerant returns to the suction pipe 11 as in the case of returning to the normal operation after the completion of the defrost operation in the refrigerating device, and the liquid refrigerant that has been asleep at the time of startup is homing. As a result of this homing, the compression element side chamber 1 is removed from the suction passage 24.
Even if the liquid refrigerant enters 2A, the suction ports 22, 23
It is possible to effectively prevent the liquid refrigerant from being sucked into the compression chambers A and B from the above, and therefore, the problem due to liquid compression can be solved, and the compression element side chamber 12A to the motor side chamber 12
The oil can be effectively returned to B and the oil agitation by the movable scroll 3 can be prevented. Moreover, by making the scroll bodies of the scrolls 2 and 3 asymmetric,
The outer diameter of the scroll (outer diameter of the end plate) can be suppressed and the size can be reduced, while liquid compression can be prevented and its reliability can be improved.

Further, in the invention according to the second aspect, since the opening position of the suction pipe 11 is shifted in the circumferential direction with respect to the suction passage 24, even if a large amount of liquid refrigerant returns from the suction pipe 11, The refrigerant can be prevented from being directly sucked from the suction pipe 11 into the suction passage 24, the problem of liquid compression can be more effectively solved, and higher reliability can be obtained.

Further, according to the third aspect of the present invention, since the suction passage 24 is displaced in the circumferential direction with respect to the suction ports 22 and 23, when the liquid refrigerant enters the suction passage 24, the liquid refrigerant scatters. It is possible to prevent the liquid refrigerant from being directly sucked into the suction ports 22 and 23, and thus to prevent the liquid refrigerant that is scattered from the suction passage 24 from being sucked into the suction ports 22 and 23, thereby causing a problem of liquid compression. Can be eliminated more effectively.

Further, in the invention according to claim 4, since the suction passage 24 is displaced with respect to the suction ports 22 and 23 to the front side in the orbiting direction of the movable scroll 3, that is, to the rear side of the winding end portion of the scroll. When the liquid refrigerant scattered from the suction passage 24 and entering the compression element side chamber 12A enters the suction ports 22 and 23, it is necessary to bypass the spiral winding end end, and the invasion is further The effect can be effectively prevented, and the effect of preventing liquid compression can be further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, in which a scroll body portion of a fixed scroll and a movable scroll is cut away to see a housing.

FIG. 2 is a longitudinal sectional view with a part omitted.

FIG. 3 is a right side view of only the housing.

FIG. 4 is a partial cross-sectional view showing another embodiment.

FIG. 5 is a vertical cross-sectional view in which part of the conventional example is omitted.

[Explanation of symbols]

1 closed casing 2
Fixed scroll 3 Movable scroll 4
Housing 11 Suction tube 12
Internal space 22,23 Suction port 24
Suction passage 25 Resistance oil return passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiromichi Ueno 3-12 Chikko Shinmachi, Sakai City, Osaka Prefecture Daikin Industrial Co., Ltd. Sakai Manufacturing Co., Ltd. Inside the seaside factory (72) Shuichi Shiromura 1304, Kanaokacho, Sakai City, Osaka Daikin Industry Co., Ltd. Sakai Plant Kanaoka Factory

Claims (4)

[Claims] 1. A scroll compression element (E) formed by meshing a fixed scroll (2) having an end plate and a scroll with a orbiting scroll (3), the scroll compression element (E) being a part of a horizontal hermetic casing (1). Is installed on one side and an electric motor (M) for turning the movable scroll (3) is installed on the other side, and a suction pipe is provided in a casing inner space (12) between the compression element (E) and the electric motor (M). In the horizontal scroll compressor having (11) opened, the winding end end of the spiral body in the fixed scroll (2) is moved from the winding end end to the winding end end of the scroll in the movable scroll (3). The two suction chambers (22) and (23) of the two compression chambers (A) and (B) that are formed between the scrolls (2) and (3) are brought close to each other.
These suction ports (22) and (23) are arranged in the upper part of the casing (1), and the internal space (12) is located between the compression element (E) and the electric motor (M). A housing (4) for partitioning 12) into a compression element side chamber (12A) and a motor side chamber (12B) is provided, and the suction port (22) (2) (2) is provided at the upper part of the housing (4).
3) is provided with a suction passageway (24) communicating with a suction portion opened, while the suction pipe (1) is provided in the electric motor side chamber (12B).
1) is opened, and a resistance oil return passage (25) is provided between the compression element side chamber (12A) and the electric motor side chamber (12B).
A horizontal scroll compressor characterized by being provided with. 2. The electric motor side chamber (12B) of the suction pipe (11)
2. The horizontal scroll compressor according to claim 1, wherein the opening position to the inlet is shifted in the circumferential direction with respect to the suction passage (24) provided in the upper portion of the housing (4). 3. A suction passage (2) provided in the housing (4).
4. The method according to claim 1, wherein 4) is circumferentially displaced with respect to the suction ports (22) and (23) of the two compression chambers (A) and (B) that are close to each other.
Alternatively, the horizontal scroll compressor described in 2. 4. A suction passage (2) provided in the housing (4).
4. The horizontal scroll compressor according to claim 3, wherein 4) is displaced relative to the suction ports (22) (23) forward of the orbiting direction of the movable scroll (3) that closes the suction ports (22) (23). .